springboot多项目依赖注入失败问题

Question

项目组成

有一个多模块项目parent,有A,B,C三个模块

A依赖B,B依赖C

C模块

CamundaApi 类

该类成员注入了IFlowAuthService

package com.parent.A.core;

@Component
public class CamundaApi {
    @Autowired
    private IFlowAuthService flowAuthService;

... ...
}

IFlowAuthService 接口

package com.parent.A.service;

public interface IFlowAuthService {
... ...
}

B模块

FlowAuthServiceImpl类

C模块中IFlowAuthService的实现类

package com.parent.B.web.service.impl;

@Service
public class FlowAuthServiceImpl implements IFlowAuthService {
... ...
}

A模块

AApplication

启动类

package com.parent;

@SpringBootApplication
@EnableDiscoveryClient
@EnableDubbo
public class AApplication{
    public static void main(String[] args) {
        SpringApplication.run(AApplication.class, args);
    }
}

启动报错

2021-08-16 11:10:53.789 ERROR 8440 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   :

***************************
APPLICATION FAILED TO START
***************************

Description:

Field flowAuthService in com.parent.C.core.CamundaApi required a bean of type 'com.parent.C.service.IFlowAuthService' that could not be found.

The injection point has the following annotations:
        - @org.springframework.beans.factory.annotation.Autowired(required=true)


Action:

Consider defining a bean of type 'com.parent.C.service.IFlowAuthService' in your configuration.

描述信息

1. 如果只有模块B和C,B依赖C,启动B可以正常启动
2. 在idea中直接运行A模块启动类不报错,只有package之后java -jar xxx.java时会报上边错误
3. 在注入IFlowAuthService 的Autowired中使用required=false依旧报上边错误
4. 在A模块启动类添加@SpringBootApplication(scanBasePackages = {"com.parent"})依旧报上边错误
5. 在模块C的CamundaApi上添加@DependsOn("flowAuthServiceImpl")依旧报上边错误

   @DependsOn("flowAuthServiceImpl")
   public class CamundaApi {
   ... ...
   }
   

请问是不是代码加载的顺序造成的该问题?如果是,是不是在加载C的时候B还未加载
请问该问题该怎么解决,谢谢

Answer 1

启动类上面加上扫描包的注解
@ComponentScan("com.parent")
另外说一下，你的类名书写格式不对，第一个首字母大写，你却首位前两个字母大写，IFlowAuthService，AApplication很明显不对
应该是IflowAuthService Aapplication